Go Back   EcoModder Forum > EcoModding > Instrumentation > OpenGauge / MPGuino FE computer
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-14-2008, 07:33 PM   #1 (permalink)
Dartmouth 2010
 
SVOboy's Avatar
 
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,427

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 114 Times in 82 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
MPGuino reading MPG backwards? Helpsky?

Decided to make a new thread for easier searching and to clutter up the release one thread a little less.

Anyway, got everything hooked up, but the MID seems to be reading the MPG in an inverted way. When I'm sitting still I get 99.9 MPG and when I'm moving during DFCO (there, I said it!) I get 0.00 MPG. Just cruising gets me like 2 MPG,

Ideas?

Thanks

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-14-2008, 07:35 PM   #2 (permalink)
Master EcoModder
 
Join Date: Jun 2008
Location: London, Ontario
Posts: 1,096

2k2Prot5 - '02 Mazda Protege5
90 day: 33.82 mpg (US)
Thanks: 0
Thanked 11 Times in 8 Posts
I suggest you floor it in first gear at all times for optimal efficiency. Your guage told you so. Just belive it.
  Reply With Quote
Old 07-14-2008, 07:39 PM   #3 (permalink)
Dartmouth 2010
 
SVOboy's Avatar
 
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,427

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 114 Times in 82 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
Quote:
Originally Posted by MazdaMatt View Post
I suggest you floor it in first gear at all times for optimal efficiency. Your guage told you so. Just belive it.
I actually tried that to confirm my idea and it worked,
  Reply With Quote
Old 07-14-2008, 07:53 PM   #4 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 266 Times in 209 Posts
Get your mph dialed in first, the first screen, upper right should be instantaneous MPH. If that is messed, then there is little hope for the rest. If it responds to the throttle pedal and not the vehicle speed, then you have your signals crossed, etc. etc.
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 07-14-2008, 08:46 PM   #5 (permalink)
Dartmouth 2010
 
SVOboy's Avatar
 
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,427

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 114 Times in 82 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
The wires weren't switched.

The Speed display was showing horribly wonky unconsistent numbers at the same speed and the distance we very underestimated. Should I just go for a drive and compare the distances and change a value? If so, which value? Is it linear?
  Reply With Quote
Old 07-14-2008, 11:07 PM   #6 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 266 Times in 209 Posts
Is the mph figure consistently low or high by a certain percentage? Or is it completely random? If it is off by a percentage then what would that percentage be? You should probably be using 8204 for the vsspulses per mile for an asian car. Can you share which specific vehicle this is going in? Any other helpful bits of info?
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 07-14-2008, 11:32 PM   #7 (permalink)
Awesomeness personified
 
AndrewJ's Avatar
 
Join Date: Dec 2007
Location: Columbia, MO
Posts: 642

Harold - '94 Honda Civic CX
90 day: 54.51 mpg (US)

Margot - '08 Surly Big Dummy
Thanks: 0
Thanked 27 Times in 17 Posts
Send a message via AIM to AndrewJ
I had the same problem with the SuperMID kit, never got it ironed out.

I suspect it was because I had the vss and inj wires switched. Double-check them Ben!

Triple-check them!

Do it now!


But yeah, make sure you don't have anything too whacky for vss/mileage parameter. The 8204 is pretty much spot-on if you're running stock diameter tires.
__________________
"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.

  Reply With Quote
Old 07-14-2008, 11:32 PM   #8 (permalink)
Dartmouth 2010
 
SVOboy's Avatar
 
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,427

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 114 Times in 82 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
I just test drove again. Looking at the IM/S:CM/D screen is seems that S is showing the injector pulse as speed.

However, when I switched the wires the speedo died and would only blip under heavy acceleration (heavy fuel use), so I'm kind of confused...I might have switched the wrong vss wire!!! That just occurred to me, I'm stupid...I'll switch them back and do it again...

This is a 91 crx, but with a vx engine, some random vss, and integra gauge cluster...I'll switch them again in the morning and see what I'm doing wrong...
  Reply With Quote
Old 07-14-2008, 11:33 PM   #9 (permalink)
Dartmouth 2010
 
SVOboy's Avatar
 
Join Date: Nov 2007
Location: Hanover, NH
Posts: 6,427

Vegan Powa! - '91 Honda CRX DX
Team Honda
90 day: 66.52 mpg (US)
Thanks: 92
Thanked 114 Times in 82 Posts
Send a message via AIM to SVOboy Send a message via MSN to SVOboy Send a message via Yahoo to SVOboy
Andrew, you're right I think, I just needed moar extra triple checking on the wirezzz, will do it in the morning when it's not dark out.
  Reply With Quote
Old 07-15-2008, 12:06 AM   #10 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 266 Times in 209 Posts
What car is it, which VSS wire on the ECU did you use and what color was it?

__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
MPGuino release one workspace dcb OpenGauge / MPGuino FE computer 1060 09-27-2016 11:56 PM
Question regarding Scangauge MPG readout & DIY device Gregte DIY / How-to 5 05-19-2008 05:58 PM
School teams to compete in cross country MPG Challenge - Possible $1,000,000 prize ericbecky EcoModding Central 9 03-22-2008 10:15 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com